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AD584KNZ Datasheet(PDF) 8 Page - Analog Devices |
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AD584KNZ Datasheet(HTML) 8 Page - Analog Devices |
8 / 12 page AD584 Data Sheet Rev. C | Page 8 of 12 NOISE FILTERING The bandwidth of the output amplifier in the AD584 can be reduced to filter output noise. A capacitor ranging between 0.01 µF and 0.1 µF connected between the CAP and VBG terminals further reduces the wideband and feedthrough noise in the output of the AD584, as shown in Figure 9 and Figure 10. However, this tends to increase the turn-on settling time of the device; therefore, allow for ample warm-up time. Figure 9. Additional Noise Filtering with an External Capacitor Figure 10. Spectral Noise Density and Total RMS Noise vs. Frequency USING THE STROBE TERMINAL The AD584 has a strobe input that can be used to zero the output. This unique feature permits a variety of new applications in signal and power conditioning circuits. Figure 11 illustrates the strobe connection. A simple NPN switch can be used to translate a TTL logic signal into a strobe of the output. The AD584 operates normally when there is no current drawn from Pin 5. Bringing this terminal low, to less than 200 mV, allows the output voltage to go to zero. In this mode, the AD584 is not required to source or sink current (unless a 0.7 V residual output is permissible). If the AD584 is required to sink a transient current while strobe is off, limit the strobe terminal input current by a 100 Ω resistor, as shown in Figure 11. Figure 11. Use of the Strobe Terminal The strobe terminal tolerates up to 5 µA leakage, and its driver should be capable of sinking 500 µA continuous. A low leakage, open collector gate can be used to drive the strobe terminal directly, provided the gate can withstand the AD584 output voltage plus 1 V. PERCISION HIGH CURRENT SUPPLY The AD584 can be easily connected to a power PNP or power PNP Darlington device to provide much greater output current capability. The circuit shown in Figure 12 delivers a precision 10 V output with up to 4 A supplied to the load. If the load has a significant capacitive component, the 0.1 µF capacitor is required. If the load is purely resistive, improved high frequency, supply rejection results from removing the capacitor. Figure 12. High Current Precision Supply AD584 1 10.0V 8 SUPPLY V+ 4 COMMON 7 CAP 6 VBG 0.01µF* TO 0.1µF *INCREASES TURN-ON TIME 1000 100 1 10 10 100 1k 10k 100k 1M FREQUENCY (Hz) NOISE SPECTRAL DENSITY (nV/ Hz) TOTAL NOISE (µV rms) UP TO SPECIFIED FREQUENCY NO CAP NO CAP 100pF 1000pF 0.01µF AD584 1 10.0V 2 3 8 V+ 4 COMMON 5 STROBE 10kΩ 20kΩ 2N2222 100Ω LOGIC INPUT HI = OFF LO = ON AD584 1 10.0V VOUT 10V @ 4A 8 V+ 4 COMMON 470Ω 0.1µF VIN ≥ 15V 2N6040 |
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